摘要： A coupling-weighted and velocity-tapered 3-dB splitter with a symmetric triple-mode evolution structure weighted by the Blackman function is analytically and numerically investigated for C+L-band passive optical network applications. The splitter is analyzed by the coupled-mode theory and simulated by the use of three-dimensional finite-difference beam propagation method. It is found that the power uniformity, wavelength dependent loss, excess loss and polarization dependent loss of the proposed 3-dB splitter in the whole C+L-band are better than 2.49×10−3dB, 0.018dB, 0.14dB, and 0.004dB, respectively. It is evident that the 3-dB splitter can achieve the good performances for C+L-band passive optical network applications. •A coupling-weighted and velocity-tapered 3-dB splitter with waveguide weighted by the Blackman function is proposed.•The splitter shows the low optical excess loss and the low sensitivity to wavelength in the whole C+L-band.•The splitter is a polarization-insensitive device in which the polarization dependent loss is less than 0.004dB in the C+L-band.•The splitter has relatively high fabrication tolerances. 出版者： Elsevier B.V 出版日期： 2015-09-01 出處： Optics communications, 2015-09, Vol.350, p.97-102 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2015 Elsevier B.V. 識別號： ISSN: 0030-4018 識別號： EISSN: 1873-0310 識別號： DOI: 10.1016/j.optcom.2015.03.055
